Improvement in thick papers



STATES PATENT OFFIon.

JUDD M. COBB, OF BELOIT, WISCONSIN.

IMPROVEMENT -IN THICK PAPERS.

Specification forming part of Letters Patent No. 147,903, dated February24, 1874; application filed July 17, 1873.

To all whom it may concern:

Be itknown that I, J UDD M. GOBB, of Beloit, in the county of Rock andState of Nisconsin, have invented a new and useful Improvement in ThickPaper; and I do hereby declare the following to be a full, clear, andexact description thereof, which will enable others skilled in the artto which my invention appertains to make and use the same.

My invention has for its object to produce a thick cheap paper for useas a floor-covering in place of oil-cloth and carpeting, as a coverin gfor the interior walls and ceilings of buildings in place of laths andplastering, and as a soft pliable wrapping or express paper to protectmachinery, furniture, and other heavy articles during transportation. Tothis end the invention consists in a new article of manufacture, to wit,a thick paper or board laid up in webs in such a manner that the finesurfaces shall be upon the outside, and the coarse surfaces within thebody of the paper, as I will now proceed to describe.

Thick paper made upon a cylinder-machine, in continuous lengths, fromstraw or rags, or from a combination of both, is formed with twosurfaces of different degrees of fineness, the surface next thecylinder-mold being the coarsest. In the process of manufacture, thewater within the cylinder is exhausted somewhat, so that its level shallbe below the level of the pulp, in which the cylinder rotates. The waterfrom the vat, rushing into the cylinder through its wire covering,carries with it, first, the long and coarser fibers of the pulp, andcauses them to adhere to the wire covering. This forms a coating ofcoarse fibers upon the cylinder, and decreases the force of the water inits passage to the interior, so that it will carry only the finer and 1igh ter particles against the coarser ones. This continues until thewater can no longer attract or carry the finest particles. As thecylinder rotates, the coucher takes off the web of paper, and deliversit to the felt with the fine surface next the latter, and the coarsesurface upon the outside. In

my invention, I join with the web of paper thus formed one or moreadditional webs, in such a manner that the surfaces of the paper orsheet thus built up shall be formed by the fine sides of the two webs,or of the two outer webs, where more than two of the latter are 7 used.

For convenience of description, I will describe the process of formingmy improved paper with two webs. The first web being laid upon the feltwith its coarse side outward, as above described, the second web iscarried to and laid upon it in the following manner: Immediately afterbeing delivered to the felt of a second cylinder by its coucher, the.second web passes between two wet press-rolls, arranged so that theupper side of the felt shall pass between them. The upper one of theserolls, acting as a kind of second coucher, takes the web from the felt,and carries it upward, from which point it is directed back over thefirst coucher to the first cylinder, and laid, with its fine sideoutward, upon the first web, or th 0 one formed by the first cylinder.The two webs thus united then continue on to the ordinary wet and drypress-rolls. By this arran gement the secondary coucher of the secondcylinder serves to turn the second web, so that it shall be laid on thefirst web with its fine side 'outward-in other words, the two webs arelaid together, to form one continuous sheet of thick paper, with thefine surfaces of the two outermost.

I am aware that thick paper has been made by running several distinctwebs upon one another; but this I do not claim.

WVhat I do claim is As a new article of manufacture, thick paper orboard consisting of two or more webs having their fine sides outward andtheir coarse sides withinthe body of the paper, substantially asdescribed, for the purposes specified.

JUDD M. COBB.

Witnesses:

MELLVILLE Cannon, E. A; ELLSWORTII.

